Missouri Key is a small island in the lower

Florida Keys The Florida Keys are a coral island, coral cay archipelago located off the southern coast of Florida, forming the southernmost part of the continental United States. They begin at the southeastern coast of the Florida peninsula, about south of ...

U.S. 1 U.S. Route 1 or U.S. Highway 1 (US 1) is a major north–south United States Numbered Highway System, United States Numbered Highway that serves the East Coast of the United States. It runs from Key West, Florida, north to Fort Kent, ...

(or the

Overseas Highway The Overseas Highway is a highway carrying U.S. Route 1 (US 1) through the Florida Keys to Key West. Large parts of it were built on the former right-of-way of the Overseas Railroad, the Key West Extension of the Florida East Coast R ...

) crosses the key at approximately mile marker 39.5, between Ohio Key and Little Duck Key. The island was named during Henry Flagler's Overseas Railroad construction years by workers from that state. It is sometimes known locally as Little Grassy Key or Grassy Island.

References

Uninhabited islands of Monroe County, Florida Islands of the Florida Keys Islands of Florida {{monroeCountyFL-geo-stub